Sleigh-knee



W. H. SPEAR.

SLEIGH KNEE.

(No Model.)

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UNITED STATES \VILLIAM H. SPEAR, OF HUMBOLDT, IOVA.

SLElGH-KNEE.

SPECIFICATION forming part of Letters Patent No. 396,005, dated January8, 1889.

Application filed S ptember 18, 1888. $erial No. 285,752. (No model.)

To (LZZ whom it may concern:

Be it known that I, WILLIAM H. SPEAR, a resident of Humboldt, in thecounty of Humboldt and State of Iowa, have invented certain new anduseful Improvements in Sleigh- Knees; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same.

My invention relates to improvements in sleigh-knees of the class thatpermit a slight rocking of the beam; and the novelty lies, piincipally,in the construction allowing such limited movement, and at the same timepreventing all motion in a transverse plane.

In the accompanying drawings, which fully illustrate this invention,Figure 1 shows 'the knee in place, seen in the direction of the beamsaxis. Fig. 2 is a section 011 the line a: y of Fig. 1. Fig. 3 is asection similar to Fig. 2, but with the construction slightly modified.

In the drawings, A is the body of the knee, and is provided at its lowerend with the usual extensions, B b, secured to the top of an ordinaryrunner, t, by bolts D D, and having a slight flange E, extending downalong the vertical face of the runner. At the upper end this body is cutaway upon one side in a vertical plane and to a depth equal to thethickness of a plate, F, which is secured to the face so formed by boltsG.

Beneath the plate the knee is cut away to form a circular recess ofuniform depth, and at the top of the recess an upwardly-flaring notch ofthe. same depth. A disk, H, fills and closely fits this recess. It isformed integrally with a plate, I, the two being connected by a shortneck, J, equal in thickness to the depth of the notch, but in width, inthe plane of the disk, somewhat less than the width of the latter. Itmay therefore swing in this plane until it meets the side walls of thenotch. The plate I is rigidly fastened to the beam K by bolts L.

The plane of the disk is perpendicular to the beam, whether or not theknee is vertical, when in operative position, and consequently is notparallel to the axis of the knee when the latter is inclined From theconstruction it is evident that the joint permits motion in the plane ofthe disk, but not in a transverse direction, such motion being resistedby the heavy plate F. This plate maybe formed integrally with the knee,as shown in Fig. 3, if desired, the knee being cast about thepreviously-formed disk by Wellknown methods. In either form the deviceavoids one of the principal strains to which a knee is subjected when noprovision is made for the rocking here permitted, and it affords a verysimple, strong, and durable knee that is believed to be novel.

lVhat I claim is 1. A sleigh-knee composed of two parts, the firstterminating in a circular disk united to the part at one side by anarrow neck in its own plane, and the second having a recess receivingand closely fitting said disk, whereby the two parts are articulated ina manner permitting limited motion in a single vertical plane only,substantially as set forth.

2. The combination, with the runner C and the beam K, of the plate I,secured to said beam and bearing the integrally-formed neck J and diskH, the knee-body A, provided with the recess in its upper end to receivesaid disk and bolted at its lower end to said runner, and the plate F,retaining said disk in said recess, substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscribiug witnesses.

\VILLIAM H. SPEAR.

\Vitnesses:

W. W. STERNs, P. F. SAUL.

